<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>首页</title>
</head>
	<!--<style>
		 body{      
        background-image:url(img/welcome.png);
			 background-size:cover; }   
     }
	</style>  --> 
	<style>
    #welcome {
  		  content:url(img/welcome.png);
  		    display: inline-block;
  			height: auto;
  			max-width: 100%;
   		 }
</style>
<body>
 <img id="welcome"/>
<script src="../js/jquery-1.8.1.min.js"></script>
<script>
   
</script>
</body>
</html>